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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,i,j,count;
    count=0;
    cin>>n;
    int a[4]={0};
    char b[n];
    char c[]={'!','@','#','$','%','^','&','*','(',')','-','+'};
    for(i=0;i<n;i++)
    {
        cin>>b[i];
        if(b[i]>='a' && b[i]<='z')
        { a[1]=1;
         
        }
        //cout<<a[1];
        if(b[i]>='A' && b[i]<='Z')
        {a[2]=1;}
       
        if(b[i]>='0' && b[i]<='9')
        {a[3]=1;}
       
        
        
        for(j=0;j<12;j++)
        {
        if(b[i]==c[j])
        {
            a[0]=1;
        }
        }
        
       
    }
    
    for(j=0;j<4;j++)
    {
        if(a[j]==0)
            count++;
    }
    
    if(6-n>count)
        cout<<6-n;
    else
        cout<<count;
    return 0;
}