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As with all penalties there is a choice, by the offended team. When you say, "at the end of the run" that could mean either a live ball foul, or a dead ball foul.
For a live ball Face mask, since the foul happened during the play, the impact of the penalty is considered part of the play. The live ball foul is administered from the end of the run, so A gained 3 yards on his own, and if A accepts the penalty they would get an additional 5 yards PLUS the down is repeated. Since it was 1st down, we repeat 1st down (have advanced 3 yards + the 5 yards of the penalty) and there is only 2 yards to go to the original Line to gain.
For a dead ball foul, since the foul happened after the play was over, the yardage situation is the same ( 3 yards gained + 5 additional yards for the penalty, but because the foul occurred AFTER the play was over, the penalty does not include repeating the down, so it's 2nd down and 2 yards to go to reach the original line to gain. The enforcement spot is the subsequent spot, the spot where the run ended, which in this case is also where the play ended and where the ball would otherwise next be put in play.
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