s = input()

for i in s :
    if not i.isdigit():
        s = s.replace(i,' ')

s = s.split(' ')
m = 0
res = ''

for i in s:     # s= ['8', '72', '6', '5', '98', '65', '1', '2']
    if len(i) > m:
        m = len(i)

for i in s:       
    if len(i) == m:
        res = res + i       # 字符串连接
print(str(res) + ',' + str(m))