numbers = {'zero':0,'one':1, 'two':2, 'three':3, 'four':4, 'five':5,
           'six':6, 'seven':7, 'eight':8, 'nine':9, 'plus':0, 0:'zero',
           1:'one', 2:'two', 3:'three', 4:'four', 5:'five',
           6:'six', 7:'seven', 8:'eight', 9:'nine', 10:'ten',
           11:'eleven', 12:'twelve', 13: 'thirteen', 14:'fourteen',
           15:'fifteen', 16:'sixteen', 17:'seventeen', 18:'eighteen' }
    
    
x = str(input())
y = x.split()
z = list(y)

a = []
for i in z:
    a.append(numbers[i])

print(numbers[sum(a)])

