Max Distance Same Characters

PYTHON:

a=input().strip()

b=[]

for i in a:

    if i not in b and a.count(i)>1:

        b.append(i)

if(b==[]):

    print(-1)

    exit()

d=[]

maxi=0

jj=""

for i in b:

    c=[]

    itera=0

    for j in a:

        if(j==i):

            c.append(itera)

        itera+=1

    first=min(c)

    last=max(c)

    if(last-first>maxi):

        jj=i

        maxi=last-first

print(jj,end="")

print(maxi)