a,b,c =  input().split()
ans = []
bef = 0
for i in range(1,1000):
	cur = bef
	if i <= len(a):
		cur += int(a[-i])
	if i <= len(b):
		cur += int(b[-i])
	if cur != 0:
		ans.append(str(cur%10))
	bef = cur//10
print("".join(ans[::-1]))