modify your code like this:
```go
package main
import (
"fmt"
"sort"
)
func main() {
//
// I am in Philadelphia, and I want to visit other cities
//
itinerary := []string{"Philadelphia", "Chicago", "Boston", "Austin", "Def"}
//
// I am in Philadelphia, and I want to visit other cities in alphabetical
order
//
sort.Slice(itinerary[1:], func(i, j int) bool {
return itinerary[1:][i] < itinerary[1:][j]
})
fmt.Println("My new itinerary is", itinerary)
}
```
because you use itinerary[1:] to sort, but your sort function choosed
itinerary's index to compare, so your result is not ok.
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