process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function minimumNumber(n, password) {
    if(!password){
        return 6;
    }
    length = password.length >=6;
    containsDigit = password.match(/[0-9]/g) != null;
    containsLowercase = password.match(/[a-z]/g) != null;
    containsUppercase = password.match(/[A-Z]/g) != null;
    containsSpecial = stringContainsSpecials(password);
    minimumNeeded = 0;
    
    while (!(containsDigit && containsLowercase && containsUppercase && containsSpecial)){
        if(!containsDigit){
           minimumNeeded++;
            containsDigit = true;
           }
        if(!containsLowercase){
           minimumNeeded++;
            containsLowercase = true;
           }
        if(!containsUppercase){
           minimumNeeded++;
            containsUppercase = true;
           }
        if(!containsSpecial){
           minimumNeeded++;
            containsSpecial = true;
           }        
    } if (password.length + minimumNeeded < 6){
        minimumNeeded += 6 - (minimumNeeded + password.length);
    }
    return minimumNeeded;
}

function main() {
    var n = parseInt(readLine());
    var password = readLine();
    var answer = minimumNumber(n, password);
    process.stdout.write("" + answer + "\n");

}
function stringContainsSpecials(str){
    specials = "!@#$%^&*()-+";
    for (var i = 0; i < specials.length; i++){
        if (str.includes(specials.substring(i, i + 1))){
            return true;
        }
    }return false;
}