s = input()
dic = {}
for x in s:
if x in dic:
dic[x] += 1
else:
dic[x] = 1
p = sorted(dic.items(), key=lambda x: x[1])
print(p[-1][1]-p[0][1])
s = input()
dic = {}
res = ""
for i in s:
if i in dic:
dic[i] += 1
else:
dic[i] = 1
if res == "":
res = i
else:
if dic[i] == dic[res]:
res = min(i, res)
else:
if dic[i] > dic[res]:
res = i
print(res)
print(dic[res])
帮我解释一下这两段代码的每一行的意思