#!/bin/bash

while read line 
do
    m=0

    for ((i=0;i<${#line};i++))
    do
        if [[ ${line:i:1} =~ [0-9] ]]
        then
            m=$(($m+1))
        fi
    done
    if [[ $m -eq 1 ]]
    then
        echo $line
    fi
done < nowcoder.txt