while True:
try:
str_in = input()
s=''
for w in str_in:
if w.isalpha():
s+='*'
else:
s+=w
s2=s.split('*')
dic={}
for w in s2:
if w !='':
dic[w]=len(w)
max_value = max(dic.values())
new_str =''
for key in dic:
if dic[key]==max_value:
new_str+=key
print(new_str+','+str(max_value))
except:
break