Example : pound or
1 p 2 o 3 u 4 n 5 d
Answer = 3 (i.e. u)
metal though
1 m 2 e 3 t 4 a 5 l
biased pant
1 b 2 i 3 a 4 s 5 d
player fight
1 p 2 l 3 a 4 y 5 r
brain tale
1 b 2 r 3 a 4 i 5 n