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Problems

First or last?

First or last?

Three digit number is given. What digit is bigger: the first digit or the last digit?

Input

One three digit number.

Output

Print the bigger digit between first and last. In case of equality, print "=" (without quotes).

Time limit 1 seconds
Memory limit 128 MiB
Input example #1
328
Output example #1
8
Input example #2
832
Output example #2
8
Source SFE-2010 Variant 3