#include <stdio.h>
#include <stdint.h>
uint8_t extract_field(uint16_t reg) {
// Your logic here
//step 1: Extraction of 5 bit field (4-8)
uint8_t extract = ((reg & 0x1F0U)>>4);
return extract;
}
int main() {
uint16_t reg;
scanf("%hx", ®);
printf("%u", extract_field(reg));
return 0;
}