def changeLetters(myString, origLtr, repLtr): newString = "" for i in myString: if i == origLtr: newString = newString + repLtr else: newString = newString + i return newString string = "Some of the earliest evidence of advanced tool use includes remnants of an early type of dart, which can be considered the ancestor of arrows as well as bows (see Operation). Reconstructions of this system have a range of over one hundred metres (yards) and can penetrate several centimetres of oak." x = changeLetters(string, "d", "f") print x
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