YOU SAID:
手紙の返事を待っている
INTO JAPANESE
九の帰事を待っます
BACK INTO ENGLISH
Wait for nine return
INTO JAPANESE
9回の帰りを待つ
BACK INTO ENGLISH
Wait for 9 returns
INTO JAPANESE
9回の返品を待つ
BACK INTO ENGLISH
Wait for 9 returns
That didn't even make that much sense in English.