codeforces-1342-B

///BISMILLAHIR-RAHMANIR-RAHIM
#include <stdio.h>
#include <string.h>
int main()
{
    int test;
    scanf("%d", &test);

    char t[105], s[105];
    int i, len, flag, j;

    while(test--){
        scanf("%s", &t);
        flag = 0;
        len = strlen(t);
        for(i = 1; i < len; i++){
            if(t[i] != t[0]){
                flag = 1;
                break;
            }
        }
        if(flag){
            s[0] = t[0];
            for(i = 1, j= 1; i < len; i++){
                if(t[i] == t[i - 1]){
                    if(t[i] == '0') s[j] = '1';
                    else s[j] = '0';
                    j++;
                    s[j] = t[i];
                    j++;
                }
                else{
                    s[j] = t[i];
                    j++;
                }
            }
            s[j] = '\0';
            printf("%s\n", s);
        }
        else{
            printf("%s\n", t);
        }
    }


    return 0;
}
///ALHAMDULILLAH