#include<bits/stdc++.h>
using namespace std ;

const int N = 100000 + 10 ;

int main() {
    string special = "!@#$%^&*()-+" , str ;
    int n , len ;
    cin >> n >> str ;
    len = n ;
    int digit = 0 , lc = 0 , uc = 0 , sp = 0 ;
    for( int i = 0 ; i < special.size() ; i++ ) {
        for( int j = 0 ; j < len ; j++ ) {
            if( special[i] == str[j] ) {
                sp = 1 ; break ;
            }
        }
    }
    for( int i = 0 ; i < len ; i++ ) {
        if( isupper( str[i] ) ) uc = 1 ;
        if( islower( str[i] ) ) lc = 1 ;
        if( isdigit( str[i] ) ) digit = 1 ;
    }
    int must = ( sp == 0 ) + ( uc == 0 ) + ( lc == 0 ) + ( digit == 0 ) ;
    int newLen = len + must ;
    int ans = must ;
    if( newLen < 6 ) {
        ans += 6 - newLen ;
    }
    cout << ans << endl ;
    return 0 ;
}