public class Solution {
    public String LeftRotateString(String str,int n) {
        if(str.length()==0)
            return str;
        StringBuffer buffer = new StringBuffer(str);
        StringBuffer buffer1 = new StringBuffer(str);
        StringBuffer buffer2 = new StringBuffer();
        buffer.delete(0,n);
        buffer1.delete(n,str.length());
        buffer2.append((buffer.append(buffer1.toString())).toString());
        return buffer2.toString();
    }
}