def main():
	import sys

	for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits)

if __name__ == '__main__':
	main() def main():
	import sys

	for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits) main import sys sys for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits) line sys.stdin sys stdin a, b = map(int, line.split()) a map(int, line.split()) map int line.split() line.split line split b c = a + b c a + b a b digits = 1 digits 1 while c // 10 != 0:
			c = c // 10
			digits += 1

		 c // 10 != 0 c // 10 c 10 0 c = c // 10 c c // 10 c 10 digits += 1 digits 1 print(digits) print digits if __name__ == '__main__':
	main() __name__ == '__main__' __name__ '__main__' main() main def main():
	import sys

	for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits) def main():
	import sys

	for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits) main
def main():
	import sys

	for line in sys.stdin:
		a, b = map(int, line.split())
		c = a + b
		digits = 1
		while c // 10 != 0:
			c = c // 10
			digits += 1

		print(digits)

if __name__ == '__main__':
	main()