#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
char sp[] = "!@#$%^&*()-+";
        
    int n,i,j,k=0,l=0,m=0,o=0,q=0;
    char p[101];
    cin>>n>>p;
    for(i=0; p[i]; i++)
    {
    if(p[i]>='0' && p[i]<='9')
        k=1;
   
    if(p[i]>='a' && p[i]<='z')
        l=1;    
    if(p[i]>='A' && p[i]<='Z')
        m=1;
    for(j=0; sp[j];j++)
        if(p[i]==sp[j])
            q=1;
    }
    if(n<6)
        j=6-n;
    else
        j=0;
    k=4-k-l-m-q;
    k=(j>k)?j:k;
    cout<<k;
    return 0;
}