while 1:
    try:
        print(len(str(sum(map(int,input().split())))))
    except: break while 1:
    try:
        print(len(str(sum(map(int,input().split())))))
    except: break 1 try:
        print(len(str(sum(map(int,input().split())))))
    except: break except: break print(len(str(sum(map(int,input().split()))))) print len(str(sum(map(int,input().split())))) len str(sum(map(int,input().split()))) str sum(map(int,input().split())) sum map(int,input().split()) map int input().split() ().split () input split
while 1:
    try:
        print(len(str(sum(map(int,input().split())))))
    except: break