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(non_snake_case)]
use std::io::*;
use std::str::FromStr;
 
pub fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed reading char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed parsing")
}
 
use std::cmp::{min, max};
use std::num;
use std::collections::HashMap;
use std::collections::HashSet;
 
const MOD : u64 = 1_000_000_000 + 7;
 
fn main() {
    
    let n = read::<String>();
    //let a = (0..n).map(|_| { (0..n-1).map(|_| { read::<usize>() - 1 }).collect::<Vec<_>>() }).collect::<Vec<_>>();
    let ans = match &n[..] {
        "Sunny" => "Cloudy",
        "Cloudy" => "Rainy",
        "Rainy" => "Sunny",
        _ => "ERR"
    };
    
    println!("{}", ans);
}