View Code of Problem 3687

#include<stdio.h>
#include<math.h>
void main()
{
    char str[1000001],c;
    int i,T,x,word,wrong,j,l;
    scanf("%d",&T);
    for(j=1;j<=T;j++)
    {
        gets(str);
        i=0;
        x=0;
        wrong=0;
        while((c=str[i])!='\0')
        {
            if(c=='C')
            {
                if(str[i+1]=='F'&&str[i+2]=='F')
                   x++;
                else if(str[i+1]!='F'||str[i+2]!='F')
                  {
                      wrong++;
                      break;
                  }
            }
            i++;
        }
           if(wrong)
        printf("Case #%d: -1\n",j);
        else
        printf("Case #%d: %d\n",j,x);
    }
}