String to2_8(String x)
{
while (x.Length()%3 != 0)
x = "0" + x;
String x8[8] = {"0","1","2","3","4","5","6","7"};
String result = "";
for (int i=0; i<x.Length()/3; i++)
        {
        char oct = 0;
        for (int d=0; d<3; d++)
                {
                if (StrToInt(x[i*3+d+1]) == 1) oct += 1<<(2-d);
                }
        result += x8[oct];
        }
return result;
}