#1LGPutBa (Python) [ptt.cc]

#/usr/bin/env python3

d = {
    "Tom": 50,
    "Jerry": 70,
    "Sally": 90,
}
check = []

while True:
    name = input("Enter name: ")

    if name == "OK":
        break
    elif name in d and name not in check:
        print('Grade: ' + str(d[name]))
        check.append(name)
    else:
        print('Already in database')