In A (achievement) competitions the girls are not competing against each other. They are trying to achieve their personal bests. Ribbons are awarded (blue for 9.0 and above, red for a score in the 8's, white for a score in the 7's, and yellow for a score below 7). Since the gymnasts are only competing for their personal achievement, there is no winner. At awards each team (or each child) is called up to salute with their score card that has ribbons stapled to it.
P (placement) is a typical competition where gymnasts compete against one another in assigned age groups.
I like achievement competitions for little ones as a low pressure introduction that allows them to get used to the logistics of a meet in a positive way.