python字典

n=input()
t=dict()
l=len(n)
ma=0
mma='a'
for i in n:
    if(i.isupper() or i.islower()):
        if (i.isupper()):
            i = i.lower()
        if i in t:
            t[i] += 1
        else:
            t[i] = 1
        if (ma < t[i]):
            ma = t[i]
            mma = i
print(mma,end=' ')
print(t[mma])