Let me check each part. If "mtrjm" is a cipher, perhaps a Caesar cipher shifted by 1 letter backwards would make it "lqsil", but that's not helpful. Try shifting forward: "mtrjm" shifted by 1 is "nuskn", that doesn't work. Maybe substitution. Let's see, in a simple substitution cipher, if each letter is shifted by a certain number. Let's try shifting each letter by -1 (backwards alphabet). M would be L, T= S, R=Q, J=I, M= L. So "LSQLI". Doesn't help. Maybe shifting letters by their position in the alphabet. M is 13, T is 20, so maybe sum letters: 13+20+18+9+13=73. Not helpful.