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Lesson 6. October 8 - 14. Char arrays

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