#!/bin/python3

import sys
def rk(s,pas):
    m=1
    for i in s:
        if i in pas:
            m=0
            break
    return m
                

def minimumNumber(n, pas):
    l=len(pas)
    s1="0123456789"
    s2="abcdefghijklmnopqrstuvwxyz"
    s3="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    s4="!@#$%^&*()-+"
    e=rk(s1,pas)
    e1=rk(s2,pas)
    e3=rk(s3,pas)
    e2=rk(s4,pas)
    x=l+e+e1+e2+e3
    if x>=6:
        return e+e1+e2+e3
    else:
        return 6-l
    # Return the minimum number of characters to make the password strong

if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)