#include <cstdio>
#include <cmath>
#define FOR( i, l, r) for(int i = (l) ; i < (r); i++)
#define FOR1(i, l, r) for(int i = (l) ; i <= (r); i++)
#define REV( i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define REV1(i, l, r) for(int i = (r) ; i >= (l); i--)
#define INC( i, n) FOR( i, 0, n)
#define INC1(i, n) FOR1(i, 1, n)
#define DEC( i, n) REV( i, 0, n)
#define DEC1(i, n) REV1(i, 1, n)
typedef long long signed int LL;
typedef long long unsigned int LU;
template<typename T> void swap(T &x, T &y) { T t = x; x = y; y = t; return; }
template<typename T> T abs(T x) { return (0 <= x ? x : -x); }
template<typename T> T max(T a, T b) { return (b <= a ? a : b); }
template<typename T> T min(T a, T b) { return (a <= b ? a : b); }
template<typename T> bool setmin(T &a, T b) { if(a <= b) { return false; } else { a = b; return true; } }
template<typename T> bool setmax(T &a, T b) { if(b <= a) { return false; } else { a = b; return true; } }
template<typename T> T gcd(T a, T b) { return (b == 0 ? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
// ---- ----
char s[101];
int main() {
scanf("%s", s);
int i = 0;
bool c = false, f = false;
while(s[i] != '\0') {
if(! c && s[i] == 'C') { c = true; }
if(c && !f && s[i] == 'F') { f = true; }
i++;
}
printf("%s\n", f ? "Yes" : "No");
return 0;
}
./Main.cpp: In function ‘int main()’:
./Main.cpp:30:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%s", s);
^