for(var a="",b="";a=readline();){var c="",d=0,e=0,f=null;f=a.length>b.length?a:b;for(var g=f.length,h=0;h<g;h++){d>=a.length&&(d=0);c+=a[d++]||"";if(f===a&&d>=a.length)break;e>=b.length&&(e=0);c+=b[e++]||""}print(c);b=c};
Note that non-ascii characters in the above source code will be escaped (such as \x9f).