589 B | 589 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
s = input().lower()
place = []
for i in range(len(s) - 1):
if s[i] == s[i + 1] == "s":
place.append(i)
p(s)
for i in place:
print(s[:i] + "B" + s[i + 2:])
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()