s.py

a = []
numMales =5
numFemales =3
K=2
b = 0
c = []
for i in range(numMales+numFemales):
        a.append("M")
for i in range(numFemales):
        c.append(((K*i))%(numMales+numFemales-i))
print c
for i in c:
        a[i]="F"
                        
print a
print "".join(a)