SSC CHSL 17 Mar 2020 Shift 2 Paper

The alphabets represents their numerical positions in English alphabetical series.
AS, C → 3 and E → 5
C → 1+ 2 = 3, M → 6 + 7 = 13
I → 9, D → 4
Similarly,
F → 6
O → 8 + 7 = 15
H → 8
∴ FOH ⇒ 6878