Task: Question Answering
Input (English): Passage: Winless Tampa Bay shocked first place Seattle by jumping out to a 21-0 lead just before halftime. However, the Seahawks came back in the second half to tie the game and force overtime. Tampa Bay won the coin toss in overtime, but went 3-and-out on their first possession. Seattle kicked a field goal on the next possession, and completed their greatest comeback (21 points) in franchise history. This dropped the Buccaneers to 0-8 on the season. They also shared that start with the Jacksonville Jaguars. Due to a Jaguars victory over the Titans in Week 8, the Buccaneers became the NFL's only winless team. 
Question: How many points were scored in the first half? 
Answer type: Number 
Output (English): 21.