import os,sys

def main():
    lower = list("abcdefghijklmnopqrstuvwxyz")
    upper = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
    digits = list("1234567890")
    special = list("!@#$%^&*()-+")
    
    v_lower = 1
    v_upper = 1
    v_dig = 1
    v_spec = 1
    v_l = 0
    
    n = int(input().strip())
    password = input().strip()
    
    for p in password:
        if p in lower:
            v_lower = 0
        if p in upper:
            v_upper = 0
        if p in digits:
            v_dig = 0
        if p in special:
            v_spec = 0
            
    violations = v_lower + v_upper + v_dig + v_spec
    
    if len(password) >= 6: v_l = 0
    else: 
        v_l = 6 - len(password) - v_lower - v_upper - v_dig - v_spec   
        if v_l < 0: v_l = 0
        
    violations += v_l
    
    print(violations)

if __name__ == '__main__':
    main()