boj 4388

* Solved 기준 브론즈3 단순 풀이

def j(v,i): return v%(10**i)//(10**(i-1))
while True:
	a,b = map(int, input().split()); t,c=0,0
	if (a,b)==(0,0): break
	for i in range(1,len(str(max(a,b)))+1):
		ta,tb = j(a,i),j(b,i)
		if(ta+tb+t>=10): c+=1; t=1
		else: s=0
	print(c)