Another method:

Rows(12).Range("C1,D1,H1,I1") = "A"
Rows(19).Range("C1,D1,H1,I1") = "B"
Rows(26).Range("C1,D1,H1,I1") = "C"
Rows(27).Range("C1,D1,H1,I1") = "D"
Rows(29).Range("C1,D1,H1,I1") =  "E"