#include <stdio.h>

int main () {
    int a, b, numa, numb, res;
    char op;
    scanf("%c %c %c", &a, &op, &b);
 //   printf("%c %c %c\n", a, op, b);
    if(a >= 97) numa = a - 96;
    else numa = a - 38;
    if(b >= 97) numb = b - 96;
    else numb = b - 38;
    if(op == '+') res = numa + numb;
    else if (op == '-') res = numa - numb;
    else if (op == '*') res = numa * numb;
    else if (op == '/') res = numa / numb;
    else if (op == '%') res = numa % numb;
    if(res >= 53) res = res - (res / 52) * 52;
    if(res <= 0) res+=52;
    if(res <= 26) printf("%c", res+96);
    else printf("%c", res+38);
//printf("%c %c %d %d %d %d %d", res+96, res+38, res, numa, numb, a, b);
    return 0;
}
//6 * 27 = 162
//f * A
//buat fungsi rekursi nanti buat cek corner case