import math
import collections
s = input()
c = collections.Counter(s)
p = 10 ** 9 + 7
untanolist = ["D","S","R","X","Q"]
a = min([c[i] for i in untanolist])
ans = 0
cnt = 0
while cnt < a:
for i in untanolist:
c[i] -= 1
cnt += 1
kans = sum(c.values())
kans = math.factorial(kans+cnt)
kans //= math.factorial(cnt)
for i in c.values():
kans //= math.factorial(i)
ans = (ans + (-1)**(cnt+1) * kans) % p
print(ans%p)
Replies to Untitled 
| Title |
Name |
Language |
UNIX |
When |
| Re: Untitled |
Funky Tapir |
python |
1590430399 |
3 Years ago. |
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