#include <stdio.h>
#include<string.h>


int main()
{
    char *char_array[]={"red_led","blue_led","buzzer","distance"};
    char *input_array[]={"red_led","2"};
    int i;
    int state;


    for(i=0;i<4;i++)
    {
   if(0==(strcmp(char_array[i],input_array[0])))
   {
       state=i;
   }
    }


   printf("output %d\n",state);



    return 0;
}