#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,k=0,a=0,b=0,c=0,d=0,x;
    cin>>n;
    char s[n];
    for(int i=0;i<n;i++)
        cin>>s[i];
    for(int i=0;i<n;i++)
    {
        if(s[i]>=65 &&s [i]<=90)
            a++;
        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]=='+')
            b++;
        if(s[i]>=97 && s[i]<=122)
            c++;
        if(s[i]>=48 && s[i]<=57)
            d++;
    }
    if(a!=0)
        k++;
    if(b!=0)
        k++;
    if(c!=0)
        k++;
    if(d!=0)
        k++;
   if(6-n>=4-k)
       x=6-n;
    else
        x=4-k;
    cout<<x;
    
        
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}