Kata

Write a function that will check if two given characters are the same case.

• If either of the characters is not a letter, return -1
• If both characters are the same case, return 1
• If both characters are letters, but not the same case, return 0

Examples

'a' and 'g' returns 1

'A' and 'C' returns 1

'b' and 'G' returns 0

'B' and 'g' returns 0

'0' and '?' returns -1