If encryption = left shift of plain: plain f → left neighbor = d (cipher). So cipher d means plain f . We have cipher f , so plain = right neighbor of f = g. That’s not “film”.
Left shift means: f ← d (because d's right is f — careful: if ciphertext is f , plaintext is to its left: f's left is d? No: For encryption: plaintext → left neighbor? We need to reverse.)
Row 1: q w e r t y u i o p Row 2: a s d f g h j k l ; Row 3: z x c v b n m , . /
Encryption: plain → right neighbor → cipher. Decryption: cipher → left neighbor → plain.
Assume: cipher = left shift of plain. So plain = right shift of cipher.
f (row2) → down to v (row3) — no. y (row1) → down to h (row2) — no.