/* -*- coding: utf-8 -*-
 *
 * 3647.cc:  No.3647 Initial Maker - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  char s[64], t[64];
  scanf("%s%s", s, t);

  printf("%c.%c.\n", s[0], t[0]);

  return 0;
}