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## Same-Case
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### Instructions
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Write a program that takes 2 arguments and returns:
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- If either of the characters is not a letter, return -1
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- If both characters are the same case, return 1
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- If both characters are letters, but not the same case, return 0
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- All outputs should be followed by a new-line character
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### Usage
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```console
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$ go run . | cat -e
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$
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$ go run . "p" "w"| cat -e
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1$
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$ go run . "p" "Q" | cat -e
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0$
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$go run . "p" "4" | cat -e
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-1$
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$ go run . "P" "Q" "W" | cat -e
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$
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$go run . A b | cat -e
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-1$
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```
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