def get_unique_covered_percentage(fuzzer_row_covered_regions,
                                  fuzzer_col_covered_regions):
    """Returns the number of regions covered by the fuzzer of the column
    but not by the fuzzer of the row."""

    unique_region_count = 0
    for region in fuzzer_col_covered_regions:
        if region not in fuzzer_row_covered_regions:
            unique_region_count += 1
    return unique_region_count