inter = input()
inters = input()
inter_n =inters.split(" ")
numf = int(inter_n[0])
nums = int(inter_n[1])
result=""

if numf < nums:
	result = inter[:numf]+inter[nums:nums+1]+inter[numf+1:nums]+inter[numf:numf+1]+inter[nums+1:]
if nums < numf:
	result = inter[:nums]+inter[numf:numf+1]+inter[nums+1:numf]+inter[nums:nums+1]+inter[numf+1:]

print(result)