#include <bits/stdc++.h>

using namespace std;

int main() {
    char too[10]={'0','1','2','3','4','5','6','7','8','9'};
    char jij[26]= {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
    char tom[26]= {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
    char temdegt[12]= {'!','@','#','$','%','^','&','*','(',')','-','+'};
    
    int n;
    cin >> n;
    string a;
    cin >> a;
    int i,j,k=0,t=0;
    for(i=0;i<n;i++){
		for(j=0;j<10;j++){
		if(a[i]==too[j]) {k++;break;}}
		if(k!=0) break;
    }
    for(i=0;i<n;i++){
		for(j=0;j<26;j++){
		if(a[i]==jij[j]) {k++;t=1;break;}}
		if(t==1) break;
    }
    t=0;
    for(i=0;i<n;i++){
		for(j=0;j<26;j++){
		if(a[i]==tom[j]) {k++;t=1;break;}}
		if(t!=0) break;
    }
    t=0;
    for(i=0;i<n;i++){
		for(j=0;j<12;j++){
		if(a[i]==temdegt[j]) {k++;t=1;break;}}
		if(t!=0) break;
    }
    t=0;
    if(n<6) t+=6-n;
    if(t>4-k) cout<<t;
    else cout<<4-k;
    return 0;
}