7-22 用天平找小球

#include <stdio.h>

int main(void)
{
    int a, b, c;
    char other;

    scanf("%d %d %d", &a, &b, &c);

    if (a == b)
    {
        other = 'C';
    }

    if (a == c)
    {
        other = 'B';
    }

    if (b == c)
    {
        other = 'A';
    }

    putchar(other);

    return 0;
}