#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

bool isA(string s){
    for(int i=0;i<s.size();i++){
        if(s[i]>='A' && s[i]<='Z') return true;
    }
    return false;
}

bool isa(string s){
    for(int i=0;i<s.size();i++){
        if(s[i]>='a' && s[i]<='z') return true;
    }
    return false;
}

bool isnum(string s){
    for(int i=0;i<s.size();i++){
        if(s[i]>='0' && s[i]<='9') return true;
    }
    return false;
}
//!@#$%^&*()-+
char dist[]={'!','@','#','$','%','^','&','*','(',')','-','+'};
bool ischar(string s){
    for(int i=0;i<s.size();i++){
        for(int j=0;j<12;j++){
            if(s[i]==dist[j]) return true;
        }
    }
    return false;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int n;cin>>n;
    string s;cin>>s;
    int ans = 0;
    if(isA(s)) ans++;
    if(isa(s)) ans++;
    if(isnum(s)) ans++;
    if(ischar(s)) ans++;
    cout<<max(4-ans,6-n)<<endl;
    
    return 0;
}