#include
<
iostream
>
using
namespace
std;
int
n;
int
f[
2010
];
int
b[
2010
];
int
c[
2010
];
char
s[
2010
];
int
main()
{
gets(s);
n
=
strlen(s);
f[
0
]
=
b[
0
]
=
c[
0
]
=
0
;
for
(
int
i
=
1
;i
<=
n;
++
i){
f[i]
=
f[i
-
1
];
b[i]
=
b[i
-
1
];
c[i]
=
c[i
-
1
];
if
(s[i
-
1
]
==
'
O
'
)
continue
;
if
(s[i
-
1
]
==
'
F
'
)
f[i]
++
;
else
if
(s[i
-
1
]
==
'
B
'
)
b[i]
+=
f[i];
else
if
(s[i
-
1
]
=
'
I
'
)
c[i]
+=
b[i];
}
printf(
"
%d\n
"
,c[n]);
return
0
;
}
posted on 2009-05-02 21:24
xfstart07 阅读(162)
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