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

int main(void)
{
    char line[512];

    while(fgets(line, sizeof(line) - 1, stdin) != 0)
    {
        if((strlen(line) - 1) & 1) // don't count the \n char
        {
            printf(line);
        }
    }

    return 0;
}