#include<iostream>

#include<cstdio>

#include<algorithm>

#include<cstring>

#include<string>

#include<stack>

#include<queue>

#include<deque>

#include<set>

#include<vector>

#include<map>

#include<functional>

#include<cmath>

#define fst first

#define sc second

#define pb push_back

#define mem(a,b) memset(a,b,sizeof(a))

#define lson l,mid,root<<1

#define rson mid+1,r,root<<1|1

#define lc root<<1

//#define rc root<<1|1

#define lowbit(x) ((x)&(-x)) 

using namespace std;

typedef double db;

typedef long double ldb;

typedef long long ll;

typedef unsigned long long ull;

typedef pair<int,int> PI;

typedef pair<ll,ll> PLL;

const db eps = 1e-;

const int mod = 1e9+;

const int maxn = 2e6+;

const int maxm = 2e6+;

const int inf = 0x3f3f3f3f;

int n;

char s1[maxn];

char s2[maxn];

int A,a,B,b,C,c,D,d;

int main(){

    scanf("%d", &n);

    scanf("%s", s1+);

    scanf("%s", s2+);

    for(int i = ; i <= n; i++){

        if(s1[i]==''){

            if((s2[i]==''))A++;

            else B++;

        }

        else{

            if(s2[i]=='')C++;

            else D++;

        }

    }

    int mm = min(A, n/);

    a = b = c = d = -;

    int ys = ;

    for(a = ; a <= A && a <= n/; a++){

        if(B+D-n/+a<=D&&B+D-n/+a>=){

            d = B+D-n/+a;

            //int m = min(min(n/2-a-d,B),n/2);

            //printf("%d %d\n",a,d);

            for(b = ; b <= B&&b<=n/-a-d; b++){

                //printf("  %d\n",b);

                if(n/-a-b-d<=C&&n/-a-b-d>=){

                    c = n/-a-b-d;

                    ys=;break;

                }

            }

            if(ys)break;

        }

    }

    //printf("%d %d %d %d\n", a,b,c,d);

    if(!ys){

        return printf("-1"),;

    }

    for(int i = ; i <= n; i++){

        if(s1[i]==''){

            if(s2[i]==''&&a){

                a--;

                printf("%d ",i);

            }

            else if(s2[i]==''&&b){

                b--;

                printf("%d ",i);

            }

        }

        else if(s1[i]==''){

            if(s2[i]==''&&c){

                c--;

                printf("%d ",i);

            }

            else if(s2[i]==''&&d){

                d--;

                printf("%d ",i);

            }

        }

    }

    return ;

}