with open("file.txt", 'r') as file:
    istr = file.readline().strip()

buf = ''
temp = ''
out = open("out.txt", 'w')
for i in istr:
    if i.isdigit():
        #print(type(buf), type(i))
        buf += i
    if i.isalpha() and buf != '':
        out.write(temp*int(buf))
        temp = i
        buf = 0
out.close()