Reverse a Number

Write the decimal digits of n in reverse order and return the resulting number. Zeros that end up at the front disappear, so 1200 becomes 21.

Implement reverse_number(n).

Input

n: A positive integer.

Output

Return the reversed number.

제약 조건

1 ≤ n ≤ 10¹⁸. The reversed value always fits a signed 64-bit integer.

예시

입력:
n = 352

예상 출력:
expected = 253

입력:
long long n = 352;

예상 출력:
long long expected = 253;

입력:
long n = 352;

예상 출력:
long expected = 253;

입력:
n = 1200

예상 출력:
expected = 21

입력:
long long n = 1200;

예상 출력:
long long expected = 21;

입력:
long n = 1200;

예상 출력:
long expected = 21;