#include <iostream>
using namespace std;
int a[2];
int main()
{
    char s;
    int t;
    a[0] = 1;
    cin.get(s);
    while (s != '\n') {
        if (s == 'A') {
            t = a[0];
            a[0] = a[1];
            a[1] = t;
        };
        if (s == 'B'){
            t = a[1];
            a[1] = a[2];
            a[2] = t;
        };
        if (s == 'C'){
            t = a[0];
            a[0] = a[2];
            a[2] = t;
        };
        cin.get(s);
    }
    for (int i = 0; i <= 2; i++)
        if (a[i] == 1)
            cout<<(i+1)<<endl;
    return 0;
}