use std::collections::HashMap;

pub fn task_one(input: &str) -> String {
    let line = input.lines().next().unwrap();
    let chars: Vec<char> = line.chars().collect();

    let mut index = 4;
    let mut iterator = chars.windows(4);

    while let Some([first, second, third, fourth]) = iterator.next() {
        if first != second && first != third && first != fourth && second != third && second != fourth && third != fourth {
            break;
        }

        index += 1;
    }

    index.to_string()
}

pub fn task_two(input: &str) -> String {

    let line = input.lines().next().unwrap();
    let chars: Vec<char> = line.chars().collect();

    let mut index = 14;
    let mut iterator = chars.windows(14);

    while let Some(slice) = iterator.next() {
        let mut dict = HashMap::new();
        let mut next = false;

        for c in slice {
            if dict.contains_key(&c) {
                next = true;
                break;
            } else {
                dict.insert(c, "");
            }
        }

        if !next {
            break;
        }

        index += 1;
    }

    index.to_string()
}