#include<bits/stdc++.h>

using namespace std;
 
// Driver program to test above functions
int main(){
 
	int n;
	cin>>n;
	string s;
	cin>>s;
	vector<int> add(4,1);
	
	for(int i=0;i<s.size();i++){
		int temp = s[i];
		if(temp>=65 && temp<=90){
			add[2]=0;
		}
		if(temp>=97 && temp<=122){
			add[1]=0;
		}
		if(s[i]=='!'||s[i]=='@'||s[i]=='#'||s[i]=='%'||s[i]=='^'||s[i]=='&'||s[i]=='*'||s[i]=='('||s[i]==')'||s[i]=='-'||s[i]=='+'||s[i]=='$'){
			add[3]=0;
		}
		if(temp>=48 && temp<=57){
			add[0]=0;
		}
	}
	
	int ans = add[0]+add[1]+add[2]+add[3];
    if(ans+s.size()<6){
        ans += 6-ans-s.size();
    }
	cout<<ans;
	
    return 0;
}