DouKaku?

#include <stdlib.h>
#include <stdio.h>

int main( int argc, char *argv[] ){
   char *p;
   int n = 0, j = 0, i = 0;

   if( argc < 2 ) return EXIT_FAILURE;

   for( p = argv[1]; *p; p++ ){
      if( *p == 'J' || *p == 'I' ){
         n = *p;
      }
      else if( n && *p == 'O' && *(p+1) == 'I' ){
         if( n == 'J' ) j++;
         if( n == 'I' ) i++;
         n = 'I';
         p++;
      }
      else{ n = 0; }
   }

   printf("%d\n%d\n",j,i);

   return EXIT_SUCCESS;
}