def prime_replace(x, l = []):
    lst = []
    string = str(x)
    for n in range(10):
    	newstr = string
        for i in l:
        	newstr = newstr[0:i]+str(n)+newstr[i+1:];
        	
        lst.append(int(newstr))
    return lst 

print prime_replace(x = 56243, l = [2, 3])