处理输入花了很长时间
import sys
def get_ans(s,n):
return s[:n]
if __name__=='__main__':
#输入一个数/字符串
lines = []
while True:
line = sys.stdin.readline().strip()
if line == "":
break
lines.append(line)
for i in range(int(len(lines)/2)):
s_in=lines[2*i]
n_in=int(lines[2*i+1])
print(get_ans(s_in,n_in))