import Foundation

func verifyIfPasswordIsStrong(_ lenght: Int, password: String) -> Int {
    var neccesaryFixes = 0
    
    //It contains at least one lowercase English character.
    let alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
    var containsLowerCaseLetter = false
    for letter in alphabet {
        containsLowerCaseLetter = password.range(of: letter) != nil
        if containsLowerCaseLetter {
            break
        }
    }
    

    let numbers = ["0","1","2","3","4","5","6","7","8","9"]
    var containsADigit = false
    for digit in numbers {
        containsADigit = password.range(of: digit) != nil
        if containsADigit {
            break
        }
    }
    
    //It contains at least one uppercase English character.
    var containsUpperCaseLetter = false
    for letter in alphabet {
        containsUpperCaseLetter = password.range(of: letter.uppercased()) != nil
        if containsUpperCaseLetter {
            break
        }
    }
    
    //It contains at least one special character. The special characters are: !@#$%^&*()-+
    let specialCharacters = ["!", "@", "#","$","%","^","&","*","(",")","-","+"]
    var containsSpecialCharacter = false
    for letter in specialCharacters {
        containsSpecialCharacter = password.range(of: letter) != nil
        if containsSpecialCharacter {
            break
        }
    }
    
    neccesaryFixes += containsLowerCaseLetter ? 0 : 1
    neccesaryFixes += containsUpperCaseLetter ? 0 : 1
    neccesaryFixes += containsSpecialCharacter ? 0 : 1
    neccesaryFixes += containsADigit ? 0 : 1
    
    // check if it doesn't have 6 digits
    var charactersToMinimun = 0
    if lenght < 6 {
        charactersToMinimun = (6 - lenght) 
    }
    
    return neccesaryFixes < charactersToMinimun ? charactersToMinimun : neccesaryFixes
}

let firstEntry = Int(readLine()!) ?? 0
let secondEntry = readLine() ?? ""

print(verifyIfPasswordIsStrong(firstEntry, password: secondEntry))