e-olymp
Competitions

December 2 - BMTK Programming School, Small League

The sum of the first and last digits of the number

Find the sum of the first and the last digit of an integer.

Input

One 32-bit number that consists of at least 2 digits. The number can be positive or negative.

Output

Print the sum of the first and the last digit of an integer.

Time limit 1 second
Memory limit 122.17 MiB
Input example #1
2345
Output example #1
7