#include <bits/stdc++.h>

using namespace std;



int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int len = password.length();
    string spl = "!@#$%^&*()-+";

    bool isDigit = false,isLower = false, isUpper = false,isSp = false;
    for(int i=0; i<len; i++){
        char c = password[i];
        if( (c >= '0') && (c<='9')  ){
            isDigit = true;
        }
       else if( (c >= 'a') && (c<='z')  ){
            isLower = true;
        }
       else if( (c >= 'A') && (c<='Z')  ){
            isUpper = true;
        }     
       else if( (c >= 'A') && (c<='Z')  ){
            isUpper = true;
        }     
       else if( spl.find( c ) != (string::npos)  ){
            isSp = true;
        }           
    }
    int count = 0;
    if( !isDigit  ){ //&& isLower && isUpper  && isSp
        count++;
    }
    if( !isLower  ){ //&&  && isUpper  && isSp
        count++;
    }    
    if( !isUpper  ){ //&&  &&   && isSp
        count++;
    }      
    if( !isSp  ){ //&&  &&   && 
        count++;
    }     
    if( len < 6 ){
        int more = 6 - len;
        if( more > count ){
            count = count + ( more - count );
        }
    }
    cout << count << endl;
    return 0;
}