#include <bits/stdc++.h>
#include <string>

using namespace std;

int func(int n, string p) {
    int hasDigit=1;
    int hasSp=1;
    int hasLC=1;
    int hasUC=1;
    for(int i=0;i<n;i++){
        if(p[i]>='0'&&p[i]<='9')
            hasDigit=0;
        else if(p[i]>='a'&&p[i]<='z')
        hasLC=0;
        else if(p[i]>='A'&&p[i]<='Z')
            hasUC=0;
        else if(p[i]=='!'||p[i]=='@'||p[i]=='#'||p[i]=='$'||p[i]=='%'||p[i]=='^'||p[i]=='&'||p[i]=='*'||p[i]=='('||p[i]==')'||p[i]=='-'||p[i]=='+')
            hasSp=0;
    }
    if(n<=3)
        return 6-n;
    if(n>=6)
        return hasDigit+hasSp+hasLC+hasUC;
    if(n==4){
        if((hasDigit+hasSp+hasLC+hasUC)>=2)
           return hasDigit+hasSp+hasLC+hasUC;
        else
            return 2;
    }
    if(n==5){
        if((hasDigit+hasSp+hasLC+hasUC)>=1)
           return hasDigit+hasSp+hasLC+hasUC;
        else
            return 1;
}
    return 0;
}
int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = func(n, password);
    cout << answer << endl;
    return 0;
}