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One Digit WANTED

Statement

 Goal

A number N is received.

While N > 9:
Make the sum of each digit in the number.

Example :
N = 999
9+9+9 = 27
2+7 = 9

Output is 9.
Input
Line 1: N the number.
Output
A single digit <= 9
Constraints
0 ≤ N ≤ 10 000 000 000 000 000
Example
Input
19
Output
1

Game modes
Fastest, Shortest

Test cases
Easy One Test
Input
19
Output
1

Validator 1 Validator
Input
11111
Output
5

Test 2 Test
Input
853
Output
7

Validator 2 Validator
Input
853
Output
7

Long One Test
Input
5623548
Output
6

Validator 3 Validator
Input
5448123
Output
9

Longest ONE Test
Input
9007199254740987
Output
9

Validator 4 Validator
Input
9007199254740975
Output
6

What about 0? Test
Input
0
Output
0

Validator 5 Validator
Input
0
Output
0

Solution language

Solution

Stub generator input