str = "PhongVan";
print(str);

strSub = str[0];
print(strSub);

strSub = str[2:4];
print(strSub);

strSub = str[3:];
print(strSub);

strSub = str * 4;
print(strSub);

strSub = str + " Tran";
print(strSub);