How to remove letters from string

Python remove string from string

s = 'ab12abc34ba'
print(s.replace('ab', ''))

Source: journaldev.com

How to remove letters from string

public extractLetters(String str){
	String result="";
	for(int i= 0; i< str.length; i++){
	    if(Character.isLetter(str.charAt(i))){
	    result+=str.charAt(i);
	  	}
	}

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