a, b, c = map(int, input().split())
d = False
#AND:
if a == 0 and b == 0 and c == 0:
    print("AND")
    d = True
elif a == 0 and not(b == 0) and c == 0:
    print("AND")
    d = True
elif not(a == 0) and b == 0 and c == 0:
    print("AND")
    d = True
elif not(a == 0) and not(b == 0) and c == 1:
    print("AND")
    d = True
#OR:
if a == 0 and b == 0 and c == 0:
    print("OR")
    d = True
elif a == 0 and not(b == 0) and c == 1:
    print("OR")
    d = True
elif not(a == 0) and b == 0 and c == 1:
    print("OR")
    d = True
elif not(a == 0) and not(b == 0) and c == 1:
    print("OR")
    d = True
#XOR:
if a == 0 and b == 0 and c == 0:
    print("XOR")
    d = True
elif a == 0 and not(b == 0) and c == 1:
    print("XOR")
    d = True
elif not(a == 0) and b == 0 and c == 1:
    print("XOR")
    d = True
elif not(a == 0) and not(b == 0) and c == 0:
    print("XOR")
    d = True
#IMPOSSIBLE:
if d == False:
    print("IMPOSSIBLE")