#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int* decode(int* encoded, int encodedSize, int* returnSize) {
    int n = encodedSize + 1;
    *returnSize = n;
    
    // Calculate XOR of all numbers 1 to n
    int totalXor = 0;
    for (int i = 1; i <= n; i++) {
        totalXor ^= i;
    }
    
    // Calculate XOR of elements at odd indices
    int oddXor = 0;
    for (int i = 1; i < encodedSize; i += 2) {
        oddXor ^= encoded[i];
    }
    
    // Find first element
    int first = totalXor ^ oddXor;
    
    // Reconstruct the permutation
    int* perm = (int*)malloc(n * sizeof(int));
    perm[0] = first;
    for (int i = 0; i < encodedSize; i++) {
        perm[i + 1] = perm[i] ^ encoded[i];
    }
    
    return perm;
}

int main() {
    char line[10000];
    fgets(line, sizeof(line), stdin);
    
    int encoded[1000];
    int encodedSize = 0;
    char* token = strtok(line, " ");
    while (token != NULL) {
        encoded[encodedSize++] = atoi(token);
        token = strtok(NULL, " ");
    }
    
    int returnSize;
    int* result = decode(encoded, encodedSize, &returnSize);
    
    for (int i = 0; i < returnSize; i++) {
        if (i > 0) printf(" ");
        printf("%d", result[i]);
    }
    printf("\n");
    
    free(result);
    return 0;
}