请教go routine，为什么总是先打印大写字母

package main import ( "fmt" "runtime" "sync" ) func main() { // Allocate 1 logical processor for the scheduler to use. runtime.GOMAXPROCS(1) // wg is used to wait for the program to finish. // Add a count of two, one for each goroutine. var wg sync.WaitGroup wg.Add(2) fmt.Println("Start Goroutines") // Declare an anonymous function and create a goroutine. go func() { // Schedule the call to Done to tell main we are done. defer wg.Done() // Display the alphabet three times for count := 0; count < 3; count++ { for char := 'a'; char < 'a'+26; char++ { fmt.Printf("%c ", char) } } }() // Declare an anonymous function and create a goroutine. go func() { // Schedule the call to Done to tell main we are done. defer wg.Done() // Display the alphabet three times for count := 0; count < 3; count++ { for char := 'A'; char < 'A'+26; char++ { fmt.Printf("%c ", char) } } }() // Wait for the goroutines to finish. fmt.Println("Waiting To Finish") wg.Wait() fmt.Println("\nTerminating Program") } Start Goroutines Waiting To Finish A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N OP Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d e f g h i j k l m n o p q r s t u v w x y z a b c de f g h i j k l m n o p q r s t u v w x y z Terminating Program 请教，为什么总是大写字母先打印？我觉得应该小写字母先打印啊。