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.

Contraintes

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

Exemples

Entrée :
n = 352

Sortie attendue :
expected = 253

Entrée :
long long n = 352;

Sortie attendue :
long long expected = 253;

Entrée :
long n = 352;

Sortie attendue :
long expected = 253;

Entrée :
n = 1200

Sortie attendue :
expected = 21

Entrée :
long long n = 1200;

Sortie attendue :
long long expected = 21;

Entrée :
long n = 1200;

Sortie attendue :
long expected = 21;