- # coding=utf8 
- # the above tag defines encoding for this document and is for Python 2.x compatibility 
-   
- import re 
-   
- pattern = r"(?=(?:.{4})*$)" 
- s = "01234567891234oooooooooooooooo321" 
- print(re.sub(pattern, "#", s)) 
-   
				IyBjb2Rpbmc9dXRmOAojIHRoZSBhYm92ZSB0YWcgZGVmaW5lcyBlbmNvZGluZyBmb3IgdGhpcyBkb2N1bWVudCBhbmQgaXMgZm9yIFB5dGhvbiAyLnggY29tcGF0aWJpbGl0eQoKaW1wb3J0IHJlCgpwYXR0ZXJuID0gciIoPz0oPzouezR9KSokKSIKcyA9ICIwMTIzNDU2Nzg5MTIzNG9vb29vb29vb29vb29vb28zMjEiCnByaW50KHJlLnN1YihwYXR0ZXJuLCAiIyIsIHMpKQo=