#include <stdio.h>
#include <assert.h>

#define MAXL 100008

void crossover(char s[], char t[], char result[]) {
    // insert your code here
}


char s[MAXL];
char t[MAXL];
char r[2*MAXL];

int main() {
    FILE *fr, *fw;

    fr = fopen("input.txt", "r");
    fw = fopen("output.txt", "w");
    assert(2 == fscanf(fr, "%s %s", s, t));

    crossover(s, t, r);
    fprintf(fw, "%s\n", r);
    fclose(fr);
    fclose(fw);
    return 0;
}