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def fun(a):
	alen=len(a)
	h1={}
	#print a
	for i in xrange(alen):
	        if a[i] not in h1:
		      h1[a[i]]=1
		else:
		      h1[a[i]]+=1
	return h1
def fun2(b,h1):
	alen=len(b)
	ns=""
	cnt=0
	for i in xrange(alen):
		if(b[i] in h1  and h1[b[i]]>0):
			cnt+=1
		else:
			break
	if cnt==alen:
		for i in xrange(alen):
			h1[b[i]]-=1
		return (b,h1)
	else:
		return ("",h1)
a=raw_input()
b=raw_input()
c=raw_input()
h1={}
alen=len(a)
h1=fun(a)
nstr=""
n2="m"
while True:
	(n2,h1)=fun2(b,h1)
	if n2!="":
		nstr+=n2
	else:
		break
n2=""
while True:
        (n2,h1)=fun2(c,h1)
        if n2  !="":
                nstr+=n2
        else:
                break
for i in h1.keys():
	nstr+=h1[i]*i
print nstr
