class Main{
	public static void main (String[] args) throws java.lang.Exception 	{
		java.util.Scanner i = new java.util.Scanner(System.in);
		int n = i.nextInt();
		int arr[] = new int[n];
		for(int k = 0; k < n; k++){
        	arr[k] = i.nextInt();
		} 
    	for(int k = 1; k < n; k+=2){
        	int q = arr[k];
        	arr[k] = arr[k-1];
        	arr[k-1] = q;
		}
		for(int k = 0; k < n; k++){
    		System.out.print(arr[k] + " ");
		}
	}
}

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NwozIDUgLTcgNyA1IC05IC00

7
3 5 -7 7 5 -9 -4