while True:
    try:
        a,b=(int(i) for i in input().split())
        print(len(str(a+b)))
    except EOFError:
        break while True:
    try:
        a,b=(int(i) for i in input().split())
        print(len(str(a+b)))
    except EOFError:
        break True try:
        a,b=(int(i) for i in input().split())
        print(len(str(a+b)))
    except EOFError:
        break except EOFError:
        break break int(i) for i in input().split() for i in input().split() i input().split() ().split () input split for i in input().split() int(i) int i a,b=(int(i) for i in input().split()) a (int(i) for i in input().split()) b print(len(str(a+b))) print len(str(a+b)) len str(a+b) str a+b a b b=(int(i) for i in input().split()) (int(i) for i in input().split()) b a,b=(int(i) for i in input().split()) (int(i) for i in input().split()) a
while True:
    try:
        a,b=(int(i) for i in input().split())
        print(len(str(a+b)))
    except EOFError:
        break