static int runTestCase(int casenum__) {
		switch (casenum__) {
		case 0: {
			String s = "cieeilll";
			String expected__ = "cl";

			return verifyCase(casenum__, expected__, new ErasingCharacters().simulate(s));
		}
		case 1: {
			String s = "topcoder";
			String expected__ = "topcoder";

			return verifyCase(casenum__, expected__, new ErasingCharacters().simulate(s));
		}
		case 2: {
			String s = "abcdefghijklmnopqrstuvwxyyxwvutsrqponmlkjihgfedcba";
			String expected__ = "";

			return verifyCase(casenum__, expected__, new ErasingCharacters().simulate(s));
		}
		case 3: {
			String s = "bacaabaccbaaccabbcabbacabcbba";
			String expected__ = "bacbaca";

			return verifyCase(casenum__, expected__, new ErasingCharacters().simulate(s));
		}
		case 4: {
			String s = "eel";
			String expected__ = "l";

			return verifyCase(casenum__, expected__, new ErasingCharacters().simulate(s));
		}

		// custom cases

		/*
		 * case 5: {
		 * String s = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * ErasingCharacters().simulate(s));
		 * }
		 */
		/*
		 * case 6: {
		 * String s = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * ErasingCharacters().simulate(s));
		 * }
		 */
		/*
		 * case 7: {
		 * String s = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * ErasingCharacters().simulate(s));
		 * }
		 */
		default:
			return -1;
		}
	}