Let's decode assuming each letter was intended to be the key to its (i.e., typist's hand was offset one key right):
Intended word: "film" f → f (no shift) — but here cipher has f as first letter, so maybe no shift on f. i on QWERTY, if typist shifted one key right → i becomes o. Not y. fylm 23 Jump Street mtrjm awn layn - fydyw lfth
Let me verify quickly with "mtrjm": m→n? no. Let’s assume a different shift: perhaps AZERTY? But unlikely. Let's decode assuming each letter was intended to
Take "fylm": f → right neighbor is g (not f) — so f itself would be intended letter if cipher letter was d. So maybe typist shifted left: ciphertext letter = intended letter’s right neighbor. Then intended = cipher’s left neighbor. Let me verify quickly with "mtrjm": m→n
f → right = g (not f) — so no.