var myString = "Hello world!     -  swift.jsrun.net"
print(myString)
var arr = ["aaa", "bbb", "ccc", "a3", "a4"]
print(arr)
var aaa = arr[2...3]
var a2 = Array(aaa)
a2[0] = "0000"
print(a2)
aaa[3] = "nnnnnn"
print(type(of:aaa))
// aaa[0] = "mm"
print(aaa)