Decipher

You have this rather mysterious message in decimal ascii form:
50 31 22 23 14 29 26 11 16 73 26 8 22 14 26 11 18 13 83 12 4 73 1 0 22 5 93 101
You only know that the key to decipher this message is 4 lettered. Find the secret message and type it.