pub fn main() {
    println!("Zadaj cislo a znacku (F/C)");
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).unwrap();
    let mut input = input.trim().to_string();
    let unit = input.remove(input.len() - 1);
    let num: f64 = input.parse().expect("Neda sa retazec premenit na cislo");
    match unit {
        'C' | 'c' => {
            println!("{}F", num * 1.8 + 32.0)
        }
        'F' | 'f' => {
            println!("{}C", (num - 32.0) / 1.8)
        }
        _ => {
            println!("nepodporovana znacka")
        }
    }
}