/*
* Author: Arpit Bhayani
* https://arpitbhayani.me
*/
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <climits>
#include <deque>
#include <iostream>
#include <list>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <vector>
#define ll long long
#define MIN(a, b) a < b ? a : b
using namespace std;
int readline(char *str) {
int i = 0;
char ch;
while((ch = getchar()) != '\n') {
str[i++] = ch;
}
str[i] = '\0';
return i;
}
int main(int argc, char *argv[]) {
char str[100010];
readline(str);
int c = 0, h = 0, e = 0, f = 0;
for( int i = 0 ; str[i]; i++ ) {
if(str[i] == 'C') {
c++;
}
else if(str[i] == 'H') {
if( c > 0 ) {
c--; h++;
}
}
else if(str[i] == 'E') {
if( h > 0 ) {
h--; e++;
}
}
else if(str[i] == 'F') {
if( e > 0 ) {
e--; f++;
}
}
}
printf("%d\n", f);
return 0;
}
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