a, b, c = map(int, input().split(' '))
points = {}
points['abc'] = 3000 - 12 * a - 10 * b - 6 * c
points['cba'] = 3000 - 2 * a - 6 * b - 12 * c
points['acb'] = 3000 - 12 * a - 4 * b - 10 * c
points['cab'] = 3000 - 6 * a - 4 * b - 12 * c

maxpts = max(points.values())
for i in ['abc', 'cba', 'acb', 'cab']:
    if points[i] == maxpts:
        print(i)