Identify Trap in Signed vs Unsigned Comparison

#include <stdio.h>
#include <stdint.h>

int safe_compare(int8_t a, uint8_t b) {
    // Your logic here
    int result;
    if(a < 0)
    {
        result = 1;
    }
    else if(b > 127)
    {
        result = 1;
    }
    else if(a<b)
    {
        result =1;
    }
    else
    result = 0;
    return result;
}

int main() {
    int8_t a;
    uint8_t b;
    scanf("%hhd %hhu", &a, &b);
    printf("%d", safe_compare(a, b));
    return 0;
}