#!/usr/bin/python

def fairShuffle(a):
    count = {}
    for i in a:
        if count.has_key(i):
            count[i] += 1
        else:
            count[i] = 1
    result = []
    # Returns a sorted list of the dictionary's keys,
    # sorted by values, lowest first:
    for key in sorted(count, key = count.get):
        newLength = len(result) + count[key]
        for i in range(1, count[key] + 1, 1):
            result.insert((i - 1) * newLength / count[key], key)
    return result

a = ["a" * 5, "b" * 3, "c" * 10, "d", "e"]
b = []
for i in a:
    for u in i:
        b.append(u)
c = fairShuffle(b)
print " ".join(c)