#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    int atleast = 6;
    int minCount=0;
    int arr[5]={0,0,0,0,0};
   
    for(int i=0;i<password.length();i++){
        if(0<=password[i]-48 && password[i]-48<=9){
            arr[0]=1;
        }
        if('a'<=password[i] && password[i]<='z'){
            arr[1]=1;
        }
        if('A'<=password[i] && password[i]<='Z'){
            arr[2]=1;
        }
        if((password[i]=='!')||(password[i]=='@')||(password[i]=='#')||(password[i]=='$')||(password[i]=='%')||(password[i]=='^')||              (password[i]=='&')||(password[i]=='*')||(password[i]=='(')||(password[i]==')')||(password[i]=='-')||(password[i]=='+')){
            arr[3]=1;       
        }
        if(n>=6){
            arr[4]=1;
        }
    }
    
    for(int i=0;i<4;i++){
        if(arr[i]==0){
            minCount++;
        }
    }
    if((n+minCount)<6){
       minCount =minCount+ (6 -(n+minCount));
    }
    return minCount;
    
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}