for else

 for item in iterable:

    if condition:

        break

else:

    # 只有當 for 迴圈「**沒有被 break 中止**」時，才會執行這裡

while True:

try:

d =[i for i in input().split()]

dd = d[:1]

for i in range(1,len(d)):

for j in range(len(dd)):

if dd[j][0]>=d[i][0]:

dd.insert(j,d[i])

break

else:

dd.append(d[i])

print(*dd)

except:

break