#include<cstdio>
using namespace std;
int f,i,j,k,s,b,sum;
char ch[3000];
int main()
{
	freopen("fbi.in","r",stdin);
	freopen("fbi.out","w",stdout);
	for (i=1;i<=3000;i++)
		ch[i]='-';
	scanf("%s",&ch);
	char chh;
	i=0;
	chh=ch[i];
	f=0;
	b=0;
	sum=0;
	while ((chh=='F')or(chh=='B')or(chh=='I')or(chh=='O'))
	{
		if (chh=='F')
			f++;
		if (chh=='B')
			b+=f;
		if (chh=='I')
			sum+=b;
		i++;
		chh=ch[i];
	}
	printf("%d",sum);
	return 0;
}