문자열 반복
T = int(input())
for tc in range(1,T+1):
x,y = map(str,input().split())
a = ''
for i in y:
a+=i*int(x)
print(a)
볕 좋은 날 시작하는 개발일기
T = int(input())
for tc in range(1,T+1):
x,y = map(str,input().split())
a = ''
for i in y:
a+=i*int(x)
print(a)