#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    int d = 0;
  
    scanf("%d%d", &a, &b);

    c = a + b;
    d = (c % 100 / 10);

    if ( d == 0)
        printf("%d\n", c % 10);
    else
        printf("%d\n", c % 100);

        return 0;
}