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Week 6: December 14 - 20. Char arrays 1

Only one letter

Print only small Latin letters a found in the given string.

Input data

One line consisting only of small Latin letters and spaces.


Print only small Latin letters a from the given string. If the letter a is not in the string, then print - 1.

Time limit 1 second
Memory limit 128 MiB
Input example #1
Output example #1
Input example #2
qwertyuiop sdfghjkl
Output example #2
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"