#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

typedef struct flag_struct
{
    int balise; //keep track of number of opened balises
unsigned int quote:
    1; //are we in a quote?
unsigned int type:
    2; //0 balise ?, 1 balise img, 2 balise a
unsigned int href:
    1; //have we detected href?
unsigned int src:
    1; //have we detected src?
unsigned int print:
    1; //should we print it?
}
flag;

void parse()
{
    const char *refs[] =
        {"img\0","src\0","href"
        };
    int cur;
    int counter=0,wcounter=0;
    flag state =
        {
            0
        };
    while((cur = fgetc(stdin)) != EOF)
    {//keep on reading stdin while everything's fine.
        cur = tolower(cur);

        if(cur == '\"')
        {//toggle state.quote
            state.quote = ~state.quote;
        }
        else if(!state.quote && cur == '<')
        {//new marker, increment state.balise
            state.balise++;
            if(state.balise == 0)
            {
                wcounter = 0;
                counter = 0;
                state.print = 0;
            }
        }
        else if(!state.quote && cur == '>')
        {//closing a marker
            state.balise--;
            if(state.balise == 0)
            {
                wcounter = 0;
                counter = 0;
                state.print = 0;
            }
        }
        else if((state.balise > 0) && isspace(cur) != 0)
        {
            if(counter >0)
                wcounter++;
            state.print = 0;
            counter = 0;
        }
        else if(!state.quote && (state.balise > 0) && (counter <= 3))
        {
            if (wcounter == 0)
            {//begining of a marker: we have our marker keyword ('a' or "img")
                if(cur == refs[0][counter] && (state.type == 1 || state.type == 0))
                {
                    state.type = 1;
                }
                else if(cur == 'a' && counter == 0)
                {
                    state.type = 2;
                }
                else
                {
                    state.type = 0;
                }
            }
            else
            {//determining if we ecounter "href" or "src"
                if(cur == refs[2][counter] && state.type == 2 && (state.href || counter == 0))
                {
                    state.href = 1;
                }
                else if(cur == refs[1][counter] && state.type == 1 && (state.src || counter == 0))
                {
                    state.src = 1;
                }
                else
                {
                    state.href = 0;
                    state.src = 0;
                }
                if((counter == 3 && state.href == 1) || (counter == 2 && state.src))
                {//all conditions filled, we can now toggle state.print
                    state.print = 1;
                    printf("\n");
                }
            }
            counter++;
        }
        else if(state.print)
        {
            if(counter > strlen(refs[state.type]))
                fputc(cur,stdout);
            else
                counter++;
        }
    }
    printf("\n");
    return;
}

int main()
{
    parse();
    return EXIT_SUCCESS;
}