#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	char p[n];
	for(int i=0;i<n;i++){
		cin>>p[i];
	}
	int s=0,d=1,l=1,u=1,sp=1;
	for(int i=0;i<n;i++){
		if(isdigit(p[i]))
		d=0;
		if(islower(p[i]))
		l=0;
		if(isupper(p[i]))
		u=0;
		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]=='^')
		sp=0;	
	}
	//cout<<d<<" "<<l<<" "<<u<<" "<<sp<<" ";
	cout<<max(6-n,d+l+u+sp)<<endl;
	return 0;	
}