{"raw_statement":[{"iden":"problem statement","content":"You are given a string $s$ consisting of lowercase English letters. Extract all the characters in the odd-indexed positions and print the string obtained by concatenating them. Here, the leftmost character is assigned the index $1$."},{"iden":"constraints","content":"*   Each character in $s$ is a lowercase English letter.\n*   $1≤|s|≤10^5$"},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$s$"},{"iden":"sample input 1","content":"atcoder"},{"iden":"sample output 1","content":"acdr\n\nExtract the first character `a`, the third character `c`, the fifth character `d` and the seventh character `r` to obtain `acdr`."},{"iden":"sample input 2","content":"aaaa"},{"iden":"sample output 2","content":"aa"},{"iden":"sample input 3","content":"z"},{"iden":"sample output 3","content":"z"},{"iden":"sample input 4","content":"fukuokayamaguchi"},{"iden":"sample output 4","content":"fkoaaauh"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}