bai tap them cua bai 3

string = 'anh di dau choi dodoremon chumeodentutuonglai' #bai a
lonnhat = ['', 0]
for char in string:
    if string.count(char) > lonnhat[1]:
        lonnhat[0] = char #phep index
        lonnhat[1] = string.count(char) #phepindexx
print(lonnhat)
#baib
string1 = 'toi laia'
ketqua = []
for i in string1:
    ketqua.append((i, string1.count(i))) # ( ky tu, so lan)
print(ketqua)