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) {
    let min = 0;
    if (password.search(/[0-9]/) == -1) ++min;
    if (password.search(/[a-z]/) == -1) ++min;
    if (password.search(/[A-Z]/) == -1) ++min;
    if (password.search(/[\!\@\#\$\%\^\&\*\(\)\-\+]/) == -1) ++min;
    if (password.length + min < 6) min += 6 - (password.length + min);
    return min;
}

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

}