AUM6AXH7STLANROVT7FIK53VEJFLYBM7NW57Y2H5GVEEDPT75GDAC
MCHVA5DYOAOEBSHENAB4FYJBVE4A47B7GDDHOEM36BXTN63ZMQNAC
for k, _ := range str {
for k := 0; k < len(str)/2+1; k++ {