//100/100
//Memory: 1.52 MB Time : 0.073 s
#include <stdio.h>

#define DNA_LENGTH      5
#define MAGIC_NUMBER        1001
#define DOT             46

char buf[MAGIC_NUMBER], result[DNA_LENGTH + 1];
unsigned short index;

int main()
{
    while (1)
    {
        fgets(buf, MAGIC_NUMBER, stdin);
        index = 0;
        while (index < MAGIC_NUMBER)
        {
            if (*(buf + index) == DOT)
            {
                puts(result);
                return 0;
            }
            result[0] ^= *(buf + index++);
            result[1] ^= *(buf + index++);
            result[2] ^= *(buf + index++);
            result[3] ^= *(buf + index++);
            result[4] ^= *(buf + index++);
        }
    }

    return 0;
}