#include<bits/stdc++.h>
using namespace std;
int main(){
    freopen("foo.in","r",stdin);
    freopen("foo.out","w",stdout);
    string str="7";
    char c;
    for(int i=0;i<=92;i++)cin>>c;
    // srand(time(NULL));
    // if(rand()%2)str="4";
    // cout<<c;'
    if(c=='}')str="4";
    cout<<str;
    return 0;
}