小南解题--字符串编辑--62ms

a=list(input())

b=list(input().split())

wz=a.index('.')

a=a[:wz+1]

if b[1] in a:

    if b[0]=='D':

        a.pop(a.index(b[1]))

    elif b[0]== 'I':

        for j in range(len(a)):       

            if b[1]==a[j]:               

                jj=j

        a.insert(jj,b[2])

    elif b[0]=="R":

        for ll in range(len(a)):

            if a[ll]==b[1]:             

                a[ll]=b[2]

    for i in a:

        print(i,end='')