favorite We need a little bit of your help to keep things running, click on this banner to learn more
Problems

# Sum of digits

Find the sum of the first and the last digit in four-digit positive integer.

#### Input

One four-digit positive integer.

#### Output

Print the sum of the first and the last digit.

Time limit 1 second
Memory limit 122.17 MiB
Input example #1
1235

Output example #1
6