Problem:
Score: 100 points

Problem Statement

The weather in Takahashi's town changes day by day, in the following cycle: Sunny, Cloudy, Rainy, Sunny, Cloudy, Rainy, ...

Given is a string S representing the weather in the town today. Predict the weather tomorrow.

Constraints

S is Sunny, Cloudy, or Rainy.

Input

Input is given from Standard Input in the following format:

S

Output

Print a string representing the expected weather tomorrow, in the same format in which input is given.

Sample Input 1

Sunny

Sample Output 1

Cloudy

In Takahashi's town, a sunny day is followed by a cloudy day.

Sample Input 2

Rainy

Sample Output 2

Sunny

Solution in Rust (1.15.1) (judge verdict: Accepted)

    #![allow(unused_imports)]
    #![allow(dead_code)]
    use std::io::prelude::*;
    use std::cmp::{max, min};
    use std::collections::BinaryHeap;

    const MOD: i64 = 1e9 as i64 + 7; 

    fn main(){
        let s: String = read();
        let ans = match &*s{
            "Sunny" => "Cloudy",
            "Cloudy" => "Rainy",
            "Rainy" => "Sunny",
            _ => "",
        };
        println!("{}", ans);
    }

    fn read<T>() -> T
    where
        T: std::str::FromStr,
    {
        let stdin = std::io::stdin();
        let token: String = stdin
            .lock()
            .bytes()
            .map(|c| c.unwrap() as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect();
        token.parse().ok().unwrap()
    }