let str;
while(str = readline()) {
let arr1 = readline().split(' ').map(Number);
let str2 = readline();
let arr2 = readline().split(' ').map(Number);
let res = [...new Set([...arr1,...arr2])];
res.sort((a,b)=>a-b);
console.log(res.join(''));
}
while(str = readline()) {
let arr1 = readline().split(' ').map(Number);
let str2 = readline();
let arr2 = readline().split(' ').map(Number);
let res = [...new Set([...arr1,...arr2])];
res.sort((a,b)=>a-b);
console.log(res.join(''));
}