#include<stdio.h> int main() { int m = 0, n = 0, l = 0, r = 0, i; char ch1, ch2; scanf("%d %d",&n,&m); char ch[50]={0}; scanf("%s", &ch); for( i = 0; i < m; ++i ) { int j = 0; scanf("%d %d %c %c", &l, &r, &ch1, &ch2); for( j = l - 1; j < r; j++ ) { if( ch[j] =...