What is my mistake in this question

#1

here is the code

#2

@hhiteshbansal_40d12e2460a1738e,
check this test case:
STUvDEee
fde

#3

how to correct run time error and in above example f is not in string 1

#4

@hhiteshbansal_40d12e2460a1738e,

refer this : https://ide.codingblocks.com/s/656787

#5

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