frame_1_6_7.java

public class Documents {

	public static void main(String[] args) {

		String a1 = "use ";
		String b2 = "knowledge ";
		String c3 = "to change the world ";
		String s = "Education is the most powerful weapon which you can use to change the world ";
		String t = "An investment in knowledge pays the best interest";
		String st = s + t;

		System.out.print(st.substring(st.indexOf(a1), st.indexOf(a1) + a1.length()));
		System.out.print(st.substring(st.indexOf(b2), st.indexOf(b2) + b2.length()));
		System.out.print(st.substring(st.indexOf(c3), st.indexOf(c3) + c3.length()));

	}
}