Problem:
Score : 100 points

Problem Statement

Given is a lowercase English letter C that is not z. Print the letter that follows C in alphabetical order.

Constraints

C is a lowercase English letter that is not z.

Input

Input is given from Standard Input in the following format:

C

Output

Print the letter that follows C in alphabetical order.

Sample Input 1

a

Sample Output 1

b

a is followed by b.

Sample Input 2

y

Sample Output 2

z

y is followed by z.

Solution in JavaScript (node.js v5.12) (judge verdict: Runtime Error)

//inputに入力データ全体が入る
let alphabet="abcdefghijklmnopqrstuvwxyz"
function Main(input) {
    let tmp=inputting(input)
    console.log(alphabet.charAt(alphabet.indexOf(tmp[0][0])))//標準出力
}
function inputting(input){
    //標準入力で受け取ったデータを、改行区切りでi行目、空白区切りでj番目のデータが[i][j]に格納される配列に変換する
    input = input.split("\n");
    let tmp=[]
    for(let i=0;i<input.length;i++){
        tmp[i]=input[i].split(" ")
    }
    return tmp
}
function parseint_array(arr){
    var ret=[]
    for(var i=0;i<arr.length;i++){
        ret[i]=[]
        for(var j=0;j<arr[i].length;j++){
            ret[i][j]=parseInt(arr[i][j])
        }
    }
    return ret
}
//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("1\n2 3\npoyo")//標準入力サンプル