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

char shift(char c, int n) {
  if (c >= 'a' && c <= 'z') return 'a' + (c - 'a' + n) % 26;
  if (c >= 'A' && c <= 'Z') return 'A' + (c - 'A' + n) % 26;
  return c;
}

int main() {
  string key, msg;
  printf("Enter keyword: ");
  scanf("%s", &key);
  printf("Enter message: ");
  scanf("%s", &msg);
  int klen = strlen(key), ki = 0;
  for (int i = 0; msg[i] != 0; i++) {
    char k = key[ki % klen];
    int n = (k >= 'a' && k <= 'z') ? k - 'a' : k - 'A';
    if ((msg[i] >= 'a' && msg[i] <= 'z') || (msg[i] >= 'A' && msg[i] <= 'Z')) {
      printf("%c", shift(msg[i], n));
      ki++;
    } else {
      printf("%c", msg[i]);
    }
  }
  printf("\n");
  return 0;
}