switch(a)
{case 0xee:key=1;break;
case 0xde:key=2;break;
case 0xbe:key=3;break;
case 0x7e:key=4;break;
case 0xed:key=5;break;
case 0xdd:key=6;break;
case 0xbd:key=7;break;
case 0x7d:key=8;break;
case 0xeb:key=9;break;
case 0xdb:key=10;break;
case 0xbb:key=11;break;
case 0x7b:key=12;break;
case 0xe7:key=13;break;
case 0xd7:key=14;break;
case 0xb7:key=15;break;
case 0x77:key=16;break;