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Answers and rating deltas for

How do I allow the user to only input a string?

Author Votes Δ
Vishnu Atrai 2 +3.88
Muhammad Umer 0 -0.11
Wolfgang 0 -1.12
tech-gayan 0 -0.78
Chris 0 -1.12
Last visited: Jan 3, 2016, 9:42:40 AM