p = open('k8-18.txt')
s = p.readline()

m, k = 1, 1
ch = []
for i in range(1, len(s)):
    if s[i] == s[i-1]:
        k+=1
        m = max(m, k)
    else:
        k = 1
for i in range(len(s)-m+1):
    if s[i:m+i].count(s[i])==m:
        ch+=[s[i]]

print(m, ch)