e-olymp
Problems

The sum of the first and the last digits in the number

The sum of the first and the last digits in 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 128 MiB
Input example #1
2345
Output example #1
7