Invert Case

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The founder of Sarma Templeton Investments wanted to test the skill of students in string operations. The question is, you are given a string $S$, you need to check whether $S$ is not empty and $S$ contains only non negative integers and alphabets. If yes, change the lowercase alphabets in $S$ to uppercase and the uppercase alphabets to lowercase and output the string. If not just output $-1$. Sol

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solution.cppC++17

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