Phone Keypads

Problem Description:

The international standard letter/number mapping found on the telephone is shown below:

1    2   3
     ABC DEF
4    5   6
GHI  JKL MNO
7    8   9
PQRS TUV WXYZ
     0

Write a program that reads a letter and displays its corresponding digit.

Think: What are the input and output of the project?

Think: What are the major steps for solving the problem?

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