I am not able to understand quetion

#1

please explain with sample input case

#2

@shakul hey shakul sharma
have a look at your phone keypad ( or the keypad used in old phones )
3 contains letters d,e,f
4 contains letters g,h,i
since divyam contains d(see 3) and i(see 4) it is a valid string and should be printed
also, sneha contains e(see 3) and h(see 4) it is also valid.