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Answers and rating deltas for

How to prevent the user from entering more than one character in the below sample code?

Author Votes Δ
King_DuckZ 2 +4.30
Bo Persson 1 +0.67
Bhargav Bhat 1 +0.31
ereOn 0 -1.25
Last visited: Sep 14, 2014, 5:07:29 AM