'''
import datetime

x = datetime.datetime.now()
print(x)

@Thato Seeletso Mmusi

2020-05-07 11:45:38.688236

'''

def dejaVu(string):
    for i in range(len(string) - 1):
        if string[i] in string[i + 1::]:
            return 'Deja Vu'
    return 'Unique'


print(dejaVu(input()))

