var
t,i,j,l1,l2,c:integer;
a,b:string;
begin
readln(t);
for i:=1 to t do
begin
l1:=0;
l2:=0;
readln(a,b);
l1:=l1+length(a);
l2:=l2+length(b);
if (l1>l2) then c:=c+l2;
if (l1<l2) then c:=c+l1;
if (l1=l2) then c:=c+l1;
for j:=1 to c do
if (l1 mod 2<>0) then write(a) else write(b);
end;
end.
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