MANYCHEF please suggest a test case where my code will fail. Its not failing & yet WA

general
1

i have tried the following test cases:-

???CIELIS???E? --> CHEFCIELISACHEF

???CIELISOUR???F --> CHEFCIELISOURCHEF

T?KEITE?SY --> TAKEITEASY

??? --> CHEFCHEF

??? --> AAACHEF

C???F --> CCHEF

& yet i am getting WA.
I have read the editorial,comments,googled it, yet no help…

can anyone come up with a test case where my code will fail ? Thanks…

Here is my code:-https://www.codechef.com/viewsolution/19061161

2

Try this:

1

C???

Your output: CHEFA

Expected output: CCHEF

3

Thanks. Got it.