while True:

try:

a = list(input())

except:

break

mx = 0

while(len(a)!=0):

b = a[0]

cnt = 0

while(b in a):

a.remove(b)

cnt += 1

if(cnt > mx):

mx = cnt

mx_t = b

print(mx_t, mx)

抱歉，誤會題目了