error 'int' object is not subscriptable - python

Question

im new in programming, i was trying simple code rle decompress, but im get error 'int' object is not subscriptable in if (JumlahKarakter[i].isalpha() == True): , how to fix this error?

this my code

TeksAsli = input("Masukan Input Teks Yan Akan Dikompress: ")
JumlahKarakter = len(TeksAsli)
Teks = ""
for i in range(0, JumlahKarakter):
    if (JumlahKarakter[i].isalpha() == True):
        for j in range(0,JumlahKarakter[i+1]):
            Teks = Teks + TeksAsli[i]

print("Hasil Decompress = ", Teks)

Answer 1

import re

TeksAsli = input("Masukan Input Teks Yan Akan Dikompress: ")
try:
    find_num = int(re.findall(r'\d+', TeksAsli)[0])
    find_text = re.sub("(\d+)", "", TeksAsli)
    Teks = ""
    for i in range(find_num):
        Teks += find_text
    print(Teks)
except IndexError:
    print("Error")