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


int main() {
    int n,t;
    cin>>n;
    t=n;
    char c;
    int u,l,d,s;
    u=l=d=s=0;
    while(n--){
        cin>>c;
        if(isupper(c)){
            u++;
        }
        else if(islower(c)){
            l++;
            
        }
        else if(isdigit(c)){
            d++;
        }
        else if(c=='!'||c=='@' || c== '#'|| c=='$'|| c=='%'|| c=='^'|| c=='&' ||c=='*' || c== '('|| c==')'|| c=='-'|| c=='+')
            s++;
    }
    int k=0;
    if(u==0){
        k++;
    }
    if(d==0){
        k++;
    }
    if(s==0){
        k++;
    }
    if(l==0){
        k++;
    }
    if(t>=6)
      cout<<k;
    else if(k>(6-t))
        cout<< k;
    else
        cout<<6-t;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}