n = input().split()
m = []
p = []
for j in n:
j = list(j)
j.insert(0, j[1])
m.append(j)
m = sorted(m)
l = 0
for i in m:
i.pop(0)
p = ''.join(i)
if (l <= (len(m) - 2)):
print(p, end=' ')
l = l + 1
else:
print(p, end='')