题解 | #字符串操作#
字符串操作
https://www.nowcoder.com/practice/06a5336b64e3481fbbcc1f7d5cba548d
n,m = map(int,input().split(' '))
s = input()
for i in range(m):
l,r,c1,c2 = input().split(' ')
tem = s[:int(l)-1]+s[int(l)-1:int(r)].replace(c1,c2)+s[int(r):]
s = tem
print(s)
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