while True:
a,b = input().split()
if a == b == '0':
break
a = a[::-1]
b = b[::-1]
c = 0
ans = 0
for i in range(min(len(a),len(b))):
if int(a[i]) + int(b[i]) + c >= 10:
ans +=1
c = (int(a[i]) + int(b[i]) + c) // 10
for i in range(min(len(a),len(b)),len(a)):
if c + int(a[i]) >=10:
ans+=1
c = (c+int(a[i]))//10
for i in range(min(len(a),len(b)),len(b)):
if c + int(b[i]) >=10:
ans+=1
c = (c+int(b[i]))//10
print(ans)