text: #include <bits/stdc++.h>
  
  void lolXor(char a[], char b[], char c[])
  {
    for (int i = 0; a[i]; i ++) c[i] = (a[i] != b[i]) + '0';
  }
  
  int main()
  {
    char a[101], b[101], c[101]; scanf("%s\n%s", a, b);
    memset(c, 0, sizeof(c)); lolXor(a, b, c);
    printf("%s\n", c);
  
    return(0);
  }