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December 2 - BMTK Programming School, Small League

The first digit of the number

Find the first digit of an integer. Start count digits from the leftmost one.

Input

One 64-bit integer containing at least one digits. The number can be negative.

Output

Print the first digit of a given integer.

Time limit 1 second
Memory limit 128 MiB
Input example #1
1234567890123
Output example #1
1
Input example #2
-7654321
Output example #2
7
Author Mykhailo Medvediev
Source Programming language C